A comparative Study on The 2nd and 4th Instar Larvae of Cotton Leafworm, Spodoptera Littoralis Treated with Methomyl and Spinetoram in The Laboratory.

Darwish, Mahmoud Ahmed Abdel-Hamid; Abdelzaher, Tahany Roshdy; Morsy, Amany R.; Elgizawy, Karam Khamis

doi:10.21608/assjm.2024.323358.1315

A comparative Study on The 2nd and 4th Instar Larvae of Cotton Leafworm, Spodoptera Littoralis Treated with Methomyl and Spinetoram in The Laboratory.

Document Type : Original Article

Authors

¹ Department of Plant Protection, Faculty of Agriculture, Benha University, Moshtohor,Toukh, 13736, Egypt

² Faculty of Agriculture at Moshtohor, Benha University

³ Department of plant protection.faculity of agriculture.Benha university

⁴ Plant Protection Department, Faculty of Agriculture, Benha University, Moshtohor,Toukh, 13736, Egypt

10.21608/assjm.2024.323358.1315

Abstract

The effects of two insecticides, namely Methomayl and Spinetoram against the 2^nd and 4^th instars larvae of cotton leafworm Spodoptera littoralis (Boisd.) (Lepidoptera: Noctuidae) by LC₅₀ concentrations were evaluated under laboratory conditions to evaluate the mortality percentage and biochemical effects. The results showed that larval mortality rate was positively correlated with the increase of concentrations of the tested insecticides, the methods of tested and time after exposure. The mortality rate in Methomayl was higher than Spinetoram. The two tested compounds caused significant decrease in the stimulation of acetylcholinesterase (AChE) and Total proteins, Total carbohydrates, GOT, GPT, Proteases, Amylase and Lipase activity and caused significant increase in the activity of GST, alpha esterase, Alkaline phosphatase.

Keywords